A DIY soil moisture sensor for my greenhouse monitoring project – schematic, probe build and why making your own is quite easy.
Using a LDR (light dependent resistor) and DHT11 temp/humidity sensors
Adding an LDR and DHT11 to my greenhouse monitoring project – light intensity, air temperature and humidity logged to emonCMS.
Stamp sized ATtiny84 remote sensor
A stamp sized ATtiny84 remote sensor – my version of Tobias’ Funky, a JeeNode Micro clone at a third of the size, 21mm across.
Using ATtiny 84’s internal temperature sensor
Reading the ATtiny84’s internal temperature sensor – no external parts, quite nice for a really low power node.
TinySensor PCB is ready
15 TinySensor v1.3 PCBs arrived – RFM12B works, the ISP connector doesn’t (my mistake), programming on a breadboard for now.
The Tiny Sensor gets a SD card port
The TinySensor gets an SD card port – spare PCB space plus a few days of thinking before the first batch order.
Tiny Sensor plans
TinySensor plans: the ATtiny84 remote sensor goes to a real PCB fab – CR2032 slot, a JeeLabs compatible port, 15 boards minimum.
Using the Sensing Shield for logging solar hot water tank temperatures to Pachube
An expandable solar hot water tank temperature logger to Pachube on the Sensing Shield – built for a forum guy new to Arduino.
Single sided ATtiny84 temperature sensor PCB
A single sided ATtiny84 temperature sensor PCB after the double-sided fiasco – etches cleanly, sends every 60 seconds.
Remote sensor’s PCB is a failure :(
The home etched PCB failed, and so did the kitchen sink – ferric chloride does not forgive. Lessons from a bad etching day.
The ATtiny84 remote sensor gets and upgrade from single analog to multiple digital temperature sensors
The TMP36 tops out at 57°C on the ATtiny84’s 1.1V reference, so the solar tank sensor moves to multiple DS18B20s on one wire.
ATtiny84 remote temperature sensor with RFM12B
An ATtiny84 remote temperature sensor with RFM12B – JeeNode Micro envy turned into my own single-chip wireless node.